591 WTNT80 EGRR 240401 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 00UTC 24.09.2021 TROPICAL STORM SAM ANALYSED POSITION : 11.4N 40.5W ATCF IDENTIFIER : AL182021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 24.09.2021 11.4N 40.5W WEAK 12UTC 24.09.2021 11.6N 43.9W WEAK LITTLE CHANGE 00UTC 25.09.2021 12.1N 46.1W WEAK INTENSIFYING SLIGHTLY 12UTC 25.09.2021 12.5N 47.8W MODERATE INTENSIFYING SLIGHTLY 00UTC 26.09.2021 13.4N 49.2W MODERATE LITTLE CHANGE 12UTC 26.09.2021 13.7N 50.4W MODERATE LITTLE CHANGE 00UTC 27.09.2021 14.2N 51.5W MODERATE LITTLE CHANGE 12UTC 27.09.2021 14.9N 52.7W MODERATE LITTLE CHANGE 00UTC 28.09.2021 15.8N 53.7W MODERATE INTENSIFYING SLIGHTLY 12UTC 28.09.2021 16.6N 54.9W STRONG LITTLE CHANGE 00UTC 29.09.2021 17.2N 56.1W STRONG INTENSIFYING SLIGHTLY 12UTC 29.09.2021 17.8N 57.6W STRONG LITTLE CHANGE 00UTC 30.09.2021 18.5N 59.3W STRONG INTENSIFYING SLIGHTLY TROPICAL STORM ODETTE ANALYSED POSITION : 44.2N 41.5W ATCF IDENTIFIER : AL152021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 24.09.2021 44.2N 41.5W WEAK 12UTC 24.09.2021 43.4N 40.7W WEAK LITTLE CHANGE 00UTC 25.09.2021 41.1N 39.2W WEAK LITTLE CHANGE 12UTC 25.09.2021 38.6N 38.2W WEAK LITTLE CHANGE 00UTC 26.09.2021 35.0N 38.6W WEAK LITTLE CHANGE 12UTC 26.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 12 HOURS FORECAST POSITION AT T+ 12 : 32.5N 62.4W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 24.09.2021 32.5N 62.4W WEAK 00UTC 25.09.2021 34.6N 64.6W WEAK LITTLE CHANGE 12UTC 25.09.2021 35.0N 65.9W WEAK LITTLE CHANGE 00UTC 26.09.2021 35.3N 65.4W WEAK LITTLE CHANGE 12UTC 26.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 36 HOURS FORECAST POSITION AT T+ 36 : 11.8N 154.4W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 25.09.2021 11.8N 154.4W WEAK 00UTC 26.09.2021 13.6N 156.3W WEAK LITTLE CHANGE 12UTC 26.09.2021 15.5N 158.6W WEAK LITTLE CHANGE 00UTC 27.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 36 HOURS FORECAST POSITION AT T+ 36 : 29.9N 34.7W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 25.09.2021 29.9N 34.7W WEAK 00UTC 26.09.2021 30.7N 33.5W WEAK LITTLE CHANGE 12UTC 26.09.2021 31.1N 33.1W WEAK LITTLE CHANGE 00UTC 27.09.2021 31.4N 33.3W WEAK LITTLE CHANGE 12UTC 27.09.2021 32.0N 34.0W WEAK LITTLE CHANGE 00UTC 28.09.2021 32.2N 35.4W WEAK LITTLE CHANGE 12UTC 28.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 78 HOURS FORECAST POSITION AT T+ 78 : 8.6N 13.6W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 27.09.2021 8.5N 15.0W WEAK INTENSIFYING RAPIDLY 00UTC 28.09.2021 8.7N 17.4W MODERATE LITTLE CHANGE 12UTC 28.09.2021 8.8N 19.9W MODERATE INTENSIFYING SLIGHTLY 00UTC 29.09.2021 9.2N 22.5W MODERATE INTENSIFYING SLIGHTLY 12UTC 29.09.2021 9.2N 25.5W MODERATE LITTLE CHANGE 00UTC 30.09.2021 9.0N 27.9W MODERATE LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 114 HOURS FORECAST POSITION AT T+114 : 33.6N 57.2W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 29.09.2021 34.1N 56.3W WEAK WEAKENING RAPIDLY 12UTC 29.09.2021 35.4N 54.4W WEAK LITTLE CHANGE 00UTC 30.09.2021 36.5N 53.0W WEAK LITTLE CHANGE THIS INFORMATION IS PROVIDED AS GUIDANCE FOR TROPICAL CYCLONE RSMCS. IT REQUIRES INTERPRETATION BY TROPICAL CYCLONE SPECIALISTS AND SHOULD NOT BE CONSIDERED AS A FINAL PRODUCT. BULLETINS ARE NOW AVAILABLE WHICH PROVIDE EXPLICIT GUIDANCE ON CENTRAL PRESSURE AND MAXIMUM WIND SPEED. FOR FURTHER INFORMATION CONTACT TROPICAL_CYCLONES@METOFFICE.GOV.UK MET OFFICE, EXETER, UK TOO 240401